Dwarfing cultivation method for Magnolia wufengensis by utilizing morphactin

Abstract

The invention discloses a dwarfing cultivation method for Magnolia wufengensis by utilizing morphactin. According to the invention, a seedling of a Magnolia wufengensis cultivar for planting in a field is used as a cultivation object, and dwarfing cultivation can be carried out when a scion grows to 40 to 60 cm. The dwarfing cultivation method comprises the following steps: spraying 200 mg / L of morphactin onto the surface of leaves; when stems and leaves of a plant return to normal growth, carrying out shaping and pruning according to a crown shape, cutting the upper part of the plant with a quarter of a plant height, and short-cutting upright vigorous lateral branches; and after two growing seasons, cutting seedling roots, and carrying out transplanting to a pot. The method provided by the invention effectively avoids vigorous growth of stem nodes of a scion of a Magnolia wufengensis grafted seedling for planting in the field, and can form a compact dwarfed plant in 2 years; and through the method provided by the invention, the characteristics of single scaffold branch and upright growth of a Magnolia wufengensis seedling under normal cultivation are changed; a tree body structurewith a plurality of scaffold branches is formed; technical difficulties of Magnolia wufengensis cultivation are solved; and the technical gap of potting cultivation of the Magnolia wufengensis is made up.

Description

Technical field [0001] The invention belongs to the field of plant planting, and relates to a plant dwarfing method, in particular to a dwarfing cultivation method for safflower magnolia grafted seedlings through growth regulators and gardening measures. Background technique [0002] Red Flower Magnolia (Magnolia wufengensis), also known as Wufeng Magnolia, is a new species of Magnolia subgenus of Magnolia family Magnolia discovered in Wufeng, Hubei, my country in 2004 by Professor Ma Luyi of Beijing Forestry University. Its petals are all red inside and outside, which belongs to Magnolia. This is the first case in plants. [0003] The safflower magnolia has extremely rich morphological variation characteristics of the flower parts, and the flower color types have different performances of dark red, red and light red; the number of tepals ranges from 9 to 46 petals; the shape of the tepals has oblong eggs Spoon-shaped, spoon-shaped and strip-shaped; flower types have different perf...

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Problems solved by technology

[0008] The inventor found through breeding experiments that it is difficult to reduce the plant height and compact plant type of the grafted seedlings of Magnolia safflower within 2 years by pruning alone: ​​after grafting in autumn, the trunk of the grafted seedlings of Magnolia safflower will be pruned to different degrees in July of the next year At the end of the growing season, the main trunk has 3 to 5 first-level side branches, the branch angles of which are less than 45°, and the uprightness is strong. At the end of the second growing season, the second-level side branches are sparse and there are few strong branches, and the plant type is thin and long

[0009] After several years of field observation, the inventor found that the proportion of the stem pith of the safflower magnolia seedlings is relatively large, the woody layer is relatively thin, and the toughness of the branches is poor. If the tree structure is adjusted by artificial bending, it is easy to cause the branches to break

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